20.500.12556/RUL-119646 Vpliv stopnje deformacije na mehanske lastnosti hladno vlečenega jekla PT929 The influence of deformation degree on mechanical properties of cold drawn PT929 steel Namen magistrskega dela je bil raziskati vpliv stopnje deformacije na mehanske lastnosti hladno vlečenega jekla PT929. Iz predhodno vroče valjanega in toplotno obdelanega kolobarja žice premera D = 8 mm smo vlekli palice različnih dimenzij in pri tem dosegali različne stopnje deformacij (0,09, 0,16, 0,32, 0,41, 0,48). S pomočjo nateznega preizkusa smo določili mehanske lastnosti jekla glede na stopnjo deformacije (mejotečenja, natezno trdnost,razteznost, kontrakcijo). Izvedli smo merjenje mikrotrdot in opravili metalografsko analizo s svetlobnim mikroskopom. Pri tem smo ugotovili, da povprečne izmerjene vrednosti mej tečenja, nateznih trdnosti in trdot z večanjem stopnje deformacije naraščajo.Padajo pa povprečne izmerjene vrednosti razteznosti in kontrakcije. Potrdili smo, da ima jeklo poboljšano martenzitno mikrostrukturo pred vlečenjem in po vlečenju. Dokazali smo tudi razogljičeno plast, ki je nastala pri predhodni izdelavi kolobarjev žice. The purpose of the master's thesis was to investigate the influence of the deformation degree on the mechanical properties of cold-drawn PT929 steel. From pre-hot rolled and heat-treated coils of wire with a diameter of D = 8 mm, rods of different dimensions were drawn, achieving different degrees of deformation (0.09, 0.16, 0.32, 0.41, 0.48). With the help of tensile test, we determined the mechanical properties of steel according to the deformation degree (yield strength, tensile strength, elongation, contraction). We performed microhardness measurements and metallographic analysis on a light microscope. We found that the average measured values of yield strength, tensile strengths and hardness increase with increasing strain ratehowever, the average measured values of elongation and contraction are decreased. We confirmed that the steel has martensitic microstructure before and after drawing. We also proved the decarburized layer formed during the fabrication of wire coils. jeklo PT929 vlečenje deformacijsko utrjevanje mehanske lastnosti steel PT929 drawing strain hardening mechanical properties true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2020-09-10 09:00:37 2020-09-10 09:00:42 2022-08-31 03:54:05 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 75031 31269891 5797.pdf 5797.pdf 1 CF1904A0AC741FFEBF9B6EE618058021 e7e46e84e01ed61ace00277190726e4c39b5ba87fa96d3714b165d40f4c60379 e23414ee-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=134371 Naravoslovnotehniška fakulteta 0 0 0